NGK plugs - Page 4 - Polaris ATV Forum
Polaris Sportsman XP 1000 Discuss the Sportsman XP 1000 and Sportsman Touring XP 1000 here.

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post #31 of 42 (permalink) Old 03-04-2019, 09:08 AM
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Thanks for the time and research man
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post #32 of 42 (permalink) Old 03-07-2019, 06:26 AM
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Originally Posted by latebird View Post
This is what my research revealed:
The plug installed at the factory is a Champion REA6MC set at .035" gap
The NGK cross reference for the REA6MC is the 6799 LZKAR7A (std. plug) with a .035" gap
The NGK 1961 ILZKR7A is an Iridium plug with a .035 gap
The NGK 6043 ILZKAR7A10 is an Iridium plug with a .040 gap

They all have the same diameter (12mm), hex (5/8"), length (26.5mm), thread pitch (1.25mm), terminal (solid nut), seal (gasket washer), tip (projected) and heat range (colder is an 8 and hotter is a 6)

You should get stock number 1961 ILZKR7A

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Question Latebird, i could not find that info when i did my plugs. I am using the 6043 im my 850, as stated i pulled Champ REA8MCX plugs, only thing i could find was these were a hotter Champ plug? and the 6043 is what guys were cross referencing. I see you say the 6 Champ is hotter than the 8 range? only cause i read the 8MCX was a hotter plug for cold weather?

Just looked it up. Champ REA8MCX is gapped. .033 to .038
So close to the NGK 6043 im using

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post #33 of 42 (permalink) Old 03-07-2019, 07:49 AM
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Yes, the Champion is gapped at .035, but the NGK 6043 ILZKAR7A10 is designed for a gap of .040 and according to NGK literature, "Gap measured with laser precision throughout the production process" - I'm sure it can be re-gapped to .035 for use in your engine. Basically the only difference between the ILZKR7A and the ILZKAR7A10 is the gap. The ILZKR7A is just the more accurate application without the need for resetting the gap.

As to heat range; that's proprietary with some the higher the number the colder the plug, with others the higher the number the hotter the plug and a Champion 6 could be the same as a NGK 8, but other manufacturers may use alpha characters for heat range where a D might be the same as a heat range 10 with another manufacturer.

With NGK and Nippon Denso, the lower the number the hotter the plug - with Champion, the higher the number the hotter the plug.

EXCEPTION: NGK Racing Plugs: (Any NGK plug that begins with the letter “R”) For NGK Racing Plugs, the Heat Range is located AFTER the hyphen. Example: R5671A-10 has a Heat Range of 10. A colder plug would be # R5671A-11 (Heat Range 11), a hotter plug would be # R5671A-9 (Heat Range 9). Some NGK Racing Plugs are also available in half heat ranges. These are displayed as a 2 or 3 digit number after the hyphen. For example, R6120-85 has a 8.5 Heat Range and R6120-105 has a 10.5 Heat Range.

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post #34 of 42 (permalink) Old 03-07-2019, 12:06 PM
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Originally Posted by latebird View Post
Yes, the Champion is gapped at .035, but the NGK 6043 ILZKAR7A10 is designed for a gap of .040 and according to NGK literature, "Gap measured with laser precision throughout the production process" - I'm sure it can be re-gapped to .035 for use in your engine. Basically the only difference between the ILZKR7A and the ILZKAR7A10 is the gap. The ILZKR7A is just the more accurate application without the need for resetting the gap.

As to heat range; that's proprietary with some the higher the number the colder the plug, with others the higher the number the hotter the plug and a Champion 6 could be the same as a NGK 8, but other manufacturers may use alpha characters for heat range where a D might be the same as a heat range 10 with another manufacturer.

With NGK and Nippon Denso, the lower the number the hotter the plug - with Champion, the higher the number the hotter the plug.

EXCEPTION: NGK Racing Plugs: (Any NGK plug that begins with the letter “R”) For NGK Racing Plugs, the Heat Range is located AFTER the hyphen. Example: R5671A-10 has a Heat Range of 10. A colder plug would be # R5671A-11 (Heat Range 11), a hotter plug would be # R5671A-9 (Heat Range 9). Some NGK Racing Plugs are also available in half heat ranges. These are displayed as a 2 or 3 digit number after the hyphen. For example, R6120-85 has a 8.5 Heat Range and R6120-105 has a 10.5 Heat Range.

Thank You! great info to have.

So just ran my 850 a few miles, it starts up the same every time very smooth no real foul smell & idels very nice, since new ILZKAR7A10 plug change 30 miles ago. So Sould i change to ILZKR7A plugs? is there damage to be done between the differences in the gap?

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post #35 of 42 (permalink) Old 03-07-2019, 01:11 PM
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No damage will be done to the engine, but a too wide gap can damage the ignition system by placing an undue load (need for increased voltage to jump the gap) on the ignition system components - timing will be a few degrees later at .040 vs .035 gap.

From one of the high performance gurus: If you drive normally and tune the engine regularly, you can increase the recommended spark plug gap by about 0.010" for better performance and better fuel economy. However, if you drive at full throttle most of the time, you should reduce the gap by about 0.010" for better performance.

Personally, I just run the recommended gap - my Honda CRF race bike specifies .031 to .035 - I set my plug at .032

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post #36 of 42 (permalink) Old 04-17-2019, 04:38 AM
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Morning all!

Looking to swap the spark plugs in my 2016 sportsman 1000 HL. This thread has been incredibly helpful but just looking for confirmation. I should run the NGK 1961 ILZKR7A Laser Iridium Plug vs the NGK 6043 ILZKAR7A10 Laser Iridium Plug due to the fact that the 1961 is gapped at 0.35mm correct? I noticed the Hex size is different (1961 is 16MM vs the 6043 is 14MM) are there any other differences I am missing? I am running the RVS stage 3 tune and messaged Ryan but haven't gotten a response. Just trying to make sure i buy the right part the first time, thanks!

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post #37 of 42 (permalink) Old 04-17-2019, 05:00 AM
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6043 is 14mm hex - 1961 is 5/8" hex
6043 can be gapped up to .040" - 1961 is for gap .028" to .032"
Specified gap for the 1000 is .030" - therefore the 1961 would be the plug to opt for - be sure to check and adjust the gap as they are not 'pre-gapped' for the ignition system they are being used with - they are pre-gapped, but may not be correct for the application
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post #38 of 42 (permalink) Old 07-10-2019, 03:29 AM
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So i went to throw in the NGK 1961 ILZKR7A Laser Iridium Plugs last night noticed they're a tad longer than the OEM plugs. Is this going to be an issue?

Also, any links to a 5/8 socket that fits in the hole? I went and bought a 5/8 thin walled spark plug socket from autozone and it was still too big.

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post #39 of 42 (permalink) Old 07-10-2019, 03:41 AM
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Idk don't sound right!!! Those pistons are designed to come really close to the plug!!! I'd be REALLY sure they're for your wheeler before firing it up!!!

How much longer are they??

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post #40 of 42 (permalink) Old 07-10-2019, 04:04 AM
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Quote:
Originally Posted by bp405 View Post
Idk don't sound right!!! Those pistons are designed to come really close to the plug!!! I'd be REALLY sure they're for your wheeler before firing it up!!!

How much longer are they??
Without having them in my hand, id say at least 1/4 to 1/2 inch possibly?

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